dead calm vs inane

dead calm

noun

  • The condition of a perfectly flat sea with no waves and no wind. 

adj

  • Completely still with no waves and no wind. 

inane

noun

  • That which is void or empty. 

adj

  • Purposeless; pointless 

  • Lacking sense or meaning (often to the point of boredom or annoyance) 

  • Lacking sense or meaning (often to the point of boredom or annoyance) (lacking sense): 

How often have the words dead calm and inane occurred in a corpus of books? (source: Google Ngram Viewer )